铜 Cu :76.0~79.0
锌 Zn:余量
铅 Pb:≤0.05
磷 P:≤0.02
铝 Al:1.8~2.3
铁 Fe:≤0.06
锑 Sb :≤0.05
砷 As :0.03~0.06
铋 Bi:≤0.002
注:≤0.3(杂质总和)